MAF transfer curves

ba114 · **Joined:** Wed Oct 21, 2015 2:36 am **Posts:** 980

highline518 wrote:

I've tried to use a FORD slot maf (05+)

black and brown grounds on engine harness bridged as well as ground and maf return pins on maf bridged with the black and brown on engine harness.

like the other guy a couple pages back, seeing 400-500 load at idle.

No resistor being used as the additional scaling isn't needed, must it be used anyway even with lower power application ? However I tried using a 10k resistor as thats what i had on hand, same issue 400-500 load.

full and partial bins modified with extended maf mode and only editing the 2048 tables using the v9 scaler sheet just released to scale maf for 2.5 inch tubing.

sometimes on key off , live data shows engine load at a static position.

From left to right looking at maf connector on engine harness

pin 1 - 12V - connected to red 12v source on engine harness
pin 2 - GRND - connected to black and brown from engine harness
pin 3 - MAF Return (signal ground i assume) - connected to black and brown from engine harness
pin 4 - MAF Signal - connected to yellow on engine harness
pin 5 - IAT not used
pin 6 - IAT not used

from what I can tell , maf signal sees .22 volts with engine off key on. little high.

Maybe it just needs a 2.2k resistor but I would think it should be possible to run as is without any resistor. The spreadsheet says these values are based on a 2.2k, but i leave the resistor value to 0, that should ulimately mean 0? or 0 on top of 2.2k . so if the value is changed to 2.2, then the total resistance calculated would be 4.4 ?

wrong wiring:
pin 1 - 12V - connect to red 12v source on engine harness
pin 2 - GRND - connect to brown from engine harness
pin 3 - MAF Return - connect to black from harness
pin 4 - MAF Signal - connected to yellow on engine harness

highline518 · **Joined:** Tue Oct 23, 2018 6:01 pm **Posts:** 16

ba114 wrote:

highline518 wrote:

I've tried to use a FORD slot maf (05+)

black and brown grounds on engine harness bridged as well as ground and maf return pins on maf bridged with the black and brown on engine harness.

like the other guy a couple pages back, seeing 400-500 load at idle.

No resistor being used as the additional scaling isn't needed, must it be used anyway even with lower power application ? However I tried using a 10k resistor as thats what i had on hand, same issue 400-500 load.

full and partial bins modified with extended maf mode and only editing the 2048 tables using the v9 scaler sheet just released to scale maf for 2.5 inch tubing.

sometimes on key off , live data shows engine load at a static position.

From left to right looking at maf connector on engine harness

pin 1 - 12V - connected to red 12v source on engine harness
pin 2 - GRND - connected to black and brown from engine harness
pin 3 - MAF Return (signal ground i assume) - connected to black and brown from engine harness
pin 4 - MAF Signal - connected to yellow on engine harness
pin 5 - IAT not used
pin 6 - IAT not used

from what I can tell , maf signal sees .22 volts with engine off key on. little high.

Maybe it just needs a 2.2k resistor but I would think it should be possible to run as is without any resistor. The spreadsheet says these values are based on a 2.2k, but i leave the resistor value to 0, that should ulimately mean 0? or 0 on top of 2.2k . so if the value is changed to 2.2, then the total resistance calculated would be 4.4 ?

wrong wiring:
pin 1 - 12V - connect to red 12v source on engine harness
pin 2 - GRND - connect to brown from engine harness
pin 3 - MAF Return - connect to black from harness
pin 4 - MAF Signal - connected to yellow on engine harness

Pin 2 and 3 do not get bridged together ?

ba114 · **Joined:** Wed Oct 21, 2015 2:36 am **Posts:** 980

highline518 wrote:

ba114 wrote:

highline518 wrote:

I've tried to use a FORD slot maf (05+)

black and brown grounds on engine harness bridged as well as ground and maf return pins on maf bridged with the black and brown on engine harness.

like the other guy a couple pages back, seeing 400-500 load at idle.

No resistor being used as the additional scaling isn't needed, must it be used anyway even with lower power application ? However I tried using a 10k resistor as thats what i had on hand, same issue 400-500 load.

full and partial bins modified with extended maf mode and only editing the 2048 tables using the v9 scaler sheet just released to scale maf for 2.5 inch tubing.

sometimes on key off , live data shows engine load at a static position.

From left to right looking at maf connector on engine harness

pin 1 - 12V - connected to red 12v source on engine harness
pin 2 - GRND - connected to black and brown from engine harness
pin 3 - MAF Return (signal ground i assume) - connected to black and brown from engine harness
pin 4 - MAF Signal - connected to yellow on engine harness
pin 5 - IAT not used
pin 6 - IAT not used

from what I can tell , maf signal sees .22 volts with engine off key on. little high.

Maybe it just needs a 2.2k resistor but I would think it should be possible to run as is without any resistor. The spreadsheet says these values are based on a 2.2k, but i leave the resistor value to 0, that should ulimately mean 0? or 0 on top of 2.2k . so if the value is changed to 2.2, then the total resistance calculated would be 4.4 ?

wrong wiring:
pin 1 - 12V - connect to red 12v source on engine harness
pin 2 - GRND - connect to brown from engine harness
pin 3 - MAF Return - connect to black from harness
pin 4 - MAF Signal - connected to yellow on engine harness

Pin 2 and 3 do not get bridged together ?

Nope.

ba114 · **Joined:** Wed Oct 21, 2015 2:36 am **Posts:** 980

Updated original post to include the audi RS4 MAF that is getting a pretty common following for MS43 users.
Have also included the m62tu maf scalar posted by pazi previously

highline518 · **Joined:** Tue Oct 23, 2018 6:01 pm **Posts:** 16

ba114 wrote:

Nope.

Interesting, well I'l go ahead and undo that. I did get the car to run very well with them bridged by reducing the MAF table but I am not happy with that solution. I will unbridge them and try again with my original table.

Thanks for the insight.

gasp0 · **Joined:** Sun Jul 27, 2014 4:42 pm **Posts:** 84

Hello, please is there anybody with 803maf and N/A engine? I have almost 3,2 liter (86,5x96,6) with ported head and 260/10,7 and 266/10,2mm cams full bolt ons .. ive now seeking around 865 load on peak which seem really high for N/A engine. Ive used 2048kg mode and scalar from this thread.

ThatSoftwareGuy · **Joined:** Sat May 04, 2019 5:23 am **Posts:** 51

Hi guys,

Short introduction: running an E30 Tournig with M52B28 engine. Having a HX35 which should be installed end of July.

On beforehand I would like to have my N/A engine running on Nissan 350Z MAF and upgrade injectors. Will start with scaling the MAF first and some finetuning. After that I will put in some Siemens Deka 630cc (60lb) injectors and use Romraider to modify the factory software and let it run as my car runsnow.

ba114 wrote:

This thread has been created to discover and document MAF transfer curves for the purposes of:
This Hitachi MAF costs roughly $20 and i have tested and confirmed functionality with great results.

In the first post I saw the Nissan 350Z produced by Hitachi will only cost like $20. Where do you get this? The cheapest I can find here (autodoc.nl) are from unkown brands and cost like + €60 for only the sensor without MAF housing.

Looking forwad to some response. The tuning is really good described and straight forward for me using this post. Would only like to know where I can have one 350Z MAF housing for a good price.

dx4picco · **Posted:** Tue Jun 09, 2020 9:17 am

My first message on the page before is a Genuine one.
But it comes in a small tube (2.5 or 2.75, I'm not sure)
So you need to build yourself a bigger one.

ThatSoftwareGuy · **Joined:** Sat May 04, 2019 5:23 am **Posts:** 51

dx4picco wrote:

My first message on the page before is a Genuine one.
But it comes in a small tube (2.5 or 2.75, I'm not sure)
So you need to build yourself a bigger one.

Thanks for your response @dx4picco

Sorry, I didn't had the time to read the full topic yet but will do this as soon as possible.

It is possible to correct for smaller diameter tube in the Excel sheet. Or is this MAF together with a 2.2k Ohm resistor still to small for running maximum 400bhp then?

dx4picco · **Posted:** Tue Jun 09, 2020 10:23 am

I do not have turbo experience on that plateform so I can't say.

ET89 · **Posted:** Tue Jun 09, 2020 11:15 am

ThatSoftwareGuy wrote:

dx4picco wrote:

My first message on the page before is a Genuine one.
But it comes in a small tube (2.5 or 2.75, I'm not sure)
So you need to build yourself a bigger one.

Thanks for your response @dx4picco

Sorry, I didn't had the time to read the full topic yet but will do this as soon as possible.

It is possible to correct for smaller diameter tube in the Excel sheet. Or is this MAF together with a 2.2k Ohm resistor still to small for running maximum 400bhp then?

For a 400bhp approx. 1500kg/hr of airflow. if you get this as a max in your scaling you are fine.

ThatSoftwareGuy · **Joined:** Sat May 04, 2019 5:23 am **Posts:** 51

ET89 wrote:

For a 400bhp approx. 1500kg/hr of airflow. if you get this as a max in your scaling you are fine.

Thanks @ET89 for sharing this information.

Will play a bit with the Excel sheet and will let know where I go for.

ThatSoftwareGuy · **Joined:** Sat May 04, 2019 5:23 am **Posts:** 51

Hi Guys,

After some research I would like to go for the M62TU (Bosch 0280217814) MAF since it is already given in a 3.5" housing and supported up to +/- 1600kg/h which should be fine for me.

However, I also found the Bosch 0280217800 MAF (from a 540/740) which is already having the round connector and should be plug and play from my M52 engine harness.

Can anyone tell me if the round connector is the only difference between these MAF units? So I can use the known scalar form the M62TU MAF.

If anyone can supply me the rewiring for the M62TU (Bosch 0280217814) MAF this is also fine.

dx4picco · **Posted:** Wed Jul 01, 2020 5:28 am

Wiring of TU is available on the Forum. Including in my Thread.
The regular 740 maf doesn't read as high if I'm not mistaken

ThatSoftwareGuy · **Joined:** Sat May 04, 2019 5:23 am **Posts:** 51

dx4picco wrote:

Wiring of TU is available on the Forum. Including in my Thread.
The regular 740 maf doesn't read as high if I'm not mistaken

Looks like to be still unclear in my eyes.

While you and @318Ti are using the following pinouts:

318Ti wrote:

Hi!,

Just to confirm M62TU MAF pinouts ...

Pin1 (Round end) : Nothing connected as its the IAT signal which isn't needed.
Pin2 : 12vdc red wire from original MAF harness.
Pin3 : Ground --> Both brown and black wires bridged from original MAF harness.
Pin4 : 5vdc
Pin5 (Square end) : MAF output going to yellow wire in original MAF harness.

Best regards

Mr. Pazzi88 is using the following pinout connections:

pazi88 wrote:

Okay. The working m62tu maf wiring is following:

Maf pin5 = yellow maf signal wire in ms41 maf wiring.
Maf pin4 = +5v
Maf pin3 = ground wire in ms41 maf wiring
Maf pin2 = +12v from ms41 maf wiring
Maf pin1 = black maf signal wire in ms41 maf wiring.

Can you confirm which are the correct ones?

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